MASSEY FERGUSON 5400 - General

Massey Ferguson 5400 - Issue 1.a
05G02.3
GBA20 output shaft with Power Shuttle
A . General
Bearings (28) (30) separated by a spacer (80) rotate
drive pinion (29) on the shaft. Bearings (79) (81)
operate as axial stops.
A double cone synchromesh enables gear range
shifting between pinions (29) (Hare) and
(36) (Tortoise).
Preloading, or the clearance between bearing cones
(39) (40) and their respective cups (48) (37) is adjusted
depending on the thickness of circlip (49).
Description
The output shaft transmits movement from the
different ranges to the rear axle transfer shaft. It is
fitted on the lower transmission line at the rear of the
unit.
It is supported at the front by a needle bearing fitted in
the mainshaft bore and at the rear by two opposing
taper roller bearings.
The shaft (44) supports:
- the drive pinion (29) fitted idle onto the combined
bearings (28) (30);
- the idle-mounted pinion (36) and ring (35) assembly;
- the Hare / Tortoise synchromesh (31), held in rota-
tion by splines.
To ensure correct operation of the assembly
depending on the load applied to the transmission,
several adjustments are required:
• J3 clearance: via the circlip (49), this cancels the
clearance between the bearing cones (39) (40) and
their respective bearing cups.
• J4 clearance: the shim(s) (38) positioned between
the shoulder of the shaft (44) and the bearing cone
(39) allow(s) end play for the pinion (29).
• J5 clearance: the shim(s) (42) between the bearing
cone (40) and the laminated shim (43) cancel the end
play of the cones (39) (40) on the shaft (44).
N
OTE: The output shaft of the GBA20 gearbox without
creeper speeds can be replaced by two other shafts
corresponding respectively to the following options:
creeper or super-creeper unit.
Parts list (Fig. 1)
(21) Synchromesh cone (Hare)
(22) Synchromesh cone (Tortoise)
(24) Needle bearing
(27) Thrust washer
(28) Needle bearing
(29) 3rd driving pinion (Hare)
(30) Needle bearing
(31) Hare / Tortoise double cone synchromesh
(32) Thrust washer
(35) Ring
(36) Tortoise pinion
(37) Bearing cup
(38) Shim(s)
(39) Bearing cone
(40) Bearing cone
(41) Screw
(42) Shim(s)
(43) Laminated shim
(44) Output shaft
(45) Circlip
(46) Stop plate
(48) Bearing cup
(49) Circlip
(79) Needle bearing
(80) Spacer
(81) Needle bearing
Overall view
Fig. 1